Sugars & Syrups
Convert teaspoons of caster sugar to grams
One teaspoon of caster sugar weighs about 4.69 g, and half a teaspoon comes to roughly 2.34 g. Enter any amount below to convert it, or use the chart further down as a quick reference while you cook.
1 tsp of caster sugar =
4.69 g
- oz
- 0.165
- kg
- 0.0047
- lb
- 0.01
Caster Sugar: 225 g per US cup · FAO / INFOODS density database. Caster (superfine) sugar has smaller crystals that pack tighter than granulated sugar, so a cup weighs more.
Full caster sugar chart →Caster Sugar at a glance
Every number on this page comes from a single figure: 225 grams per US cup (FAO / INFOODS density database).
- 1 cup
- 225 g
- 1 tablespoon
- 14.1 g
- 1 teaspoon
- 4.69 g
- 1 cup in ounces
- 7.94 oz
- 100 g in cups
- 0.444 cups
- Density
- 0.95 g/ml
teaspoons to grams chart for caster sugar
Print it, screenshot it, or bookmark this page — these are the amounts recipes ask for most often.
| Teaspoons (US) | Grams | Ounces (weight) | Pounds |
|---|---|---|---|
| 1/4 tsp | 1.17 g | 0.041 oz | 0.0026 lb |
| 1/2 tsp | 2.34 g | 0.083 oz | 0.0052 lb |
| 3/4 tsp | 3.52 g | 0.124 oz | 0.0078 lb |
| 1 tsp | 4.69 g | 0.165 oz | 0.01 lb |
| 1 1/2 tsp | 7.03 g | 0.248 oz | 0.016 lb |
| 2 tsp | 9.38 g | 0.331 oz | 0.021 lb |
| 3 tsp | 14.1 g | 0.496 oz | 0.031 lb |
| 4 tsp | 18.8 g | 0.661 oz | 0.041 lb |
| 6 tsp | 28.1 g | 0.992 oz | 0.062 lb |
| 8 tsp | 37.5 g | 1.32 oz | 0.083 lb |
How this conversion is calculated
Volume-to-weight conversions are only as good as the density behind them. We treat caster sugar as 225 g per US customary cup, which works out to 0.951 g/ml. From there:
- Your teaspoons figure is converted into millilitres or grams using standard unit sizes (tsp = 4.93 ml).
- The density above bridges volume and weight in whichever direction you need.
- The result is rounded the way a cook would round it — to the nearest gram, or to a usable fraction such as 1/2 cups.
Measuring caster sugar accurately
Caster (superfine) sugar has smaller crystals that pack tighter than granulated sugar, so a cup weighs more.
If a recipe matters to you — bread, macarons, anything with a tight hydration or ratio — weigh it. A £10 digital scale removes the single largest source of variation in home baking, and it is faster than washing three measuring cups.
When cups are fine
- Liquids measured in a proper jug, where volume is the honest unit anyway.
- Forgiving savoury cooking: soups, stews, stir-fries, marinades.
- Small amounts of leaveners and spices, as long as you use level spoons.
Frequently asked questions
How many grams are in 1 teaspoon of caster sugar?
1 teaspoon of caster sugar is 4.69 g. This is based on a density of 225 g per US cup.
How many grams are in 2 teaspoons of caster sugar?
2 teaspoons of caster sugar is 9.38 g, and 2.34 g for half a teaspoon.
How much is 100 g of caster sugar in cups?
100 g of caster sugar is about 1/2 cups. Weight is always the more reliable measurement, so use a scale when the recipe gives grams.
Why do other sites give a different number for caster sugar?
Caster (superfine) sugar has smaller crystals that pack tighter than granulated sugar, so a cup weighs more.
Do UK and Australian cups give the same result?
No. A US customary cup is 236.6 ml, a metric cup used in Australia and New Zealand is 250 ml, and an old UK imperial cup is 284 ml. Our default is the US cup, but you can pick metric cups in the converter.